A ventilated Ray Optics box which is open fronted with extended sides finned externally for heat dissipation and vertical internal grooves to accommodate a slit plate and cylindrical lens.The ray box includes:1 x 12V, 21W lamp with one meter of twin flex ending in 4mm connectors,A slit plate with single and triple slit, whitened on one side, black matt on the other.Collimating LensThe ray box operates on a 12V power supply (B8G85458) which is not included.45mm width: not suitable for use with 50mm filters.Replacement bulb is available to purchase separately (B8A56820).